Whenever Wildfire Eternal attacks and isn’t blocked, you may cast an instant or sorcery card from your hand without paying its mana cost.
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I’ve been thinking about this for awhile. There’s quite a few cards in Standard that can deal incidental damage. You know, stuff like Unlicensed Disintegration. You do your thing and deal damage to the opponent at the same time. Can we just put them all in a deck and just push enough damage through? Not really sure, but this one might help. Remember that you can still pay additional costs, like for Collective Defiance, even if you can’t pay more than one alternative cost.